最近，中國科學(xué)院西雙版納熱帶植物園生理生態(tài)研究組的張石寶,、曹坤芳等研究人員在生物地理學(xué)頂尖期刊《全球生態(tài)和生物地理學(xué)》（Global Ecology and Biogeography）上撰文論述了系統(tǒng)發(fā)育和環(huán)境如何影響陸生植物的葉片養(yǎng)分含量,。這是該研究組在這個雜志上發(fā)表的第二篇論文,。
陸地生態(tài)系統(tǒng)的功能和生物地球化學(xué)循環(huán)與葉片元素含量緊密相關(guān),，因此認識影響葉片元素含量的生物、生態(tài)因子對于模擬生態(tài)系統(tǒng)的生產(chǎn)力,、養(yǎng)分流及其對全球變化的響應(yīng)具有重要意義,。作者收集了中國702種陸生植物的10種葉片元素含量及其環(huán)境因子，利用Partial Mantel test排除變量自相關(guān)因素來分析環(huán)境因子對葉片元素含量影響的偏相關(guān)系數(shù),，同時利用系統(tǒng)發(fā)育比較方法排除系統(tǒng)發(fā)育的影響分析葉片元素含量與環(huán)境因子的相關(guān)關(guān)系,。結(jié)果發(fā)現(xiàn)，系統(tǒng)發(fā)育解釋了葉片S和SiO2元素含量40.2-43.9%的變異,。相反,，緯度能夠解釋葉片N、P,、K,、Fe、Al、Mn,、Na和Ca含量19.5-52.1%的變異,，其影響大于系統(tǒng)發(fā)育。在科水平上,，葉片N,、P、Al,、Fe和Na含量與年降雨量相關(guān),，而N、P和Fe含量與年均溫相關(guān),。主分量分析表明與植物蛋白合成和光合作用相關(guān)的元素（N、P,、K,、S、Fe）均落在主成分第一軸上,，該主軸與緯度,、年降雨量和年均溫緊密相關(guān)。因此在全球變化背景下,，溫度和降雨量的變化將直接改變植被中葉片元素的空間式樣,、以及生態(tài)系統(tǒng)的養(yǎng)分循環(huán)和功能的變化。(生物谷 Bioon.com)
doi:10.1111/j.1466-8238.2011.00729.x
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Leaf element concentrations of terrestrial plants across China are influenced by taxonomy and the environment
Zhang, Shi‐Bao; Zhang, Jiao‐Lin; Slik, J. W. Ferry; Cao, Kun‐Fang
Keywords:Biogeography;China;climate;latitudinal gradient;leaf element;Mantel test;phylogenetically comparative method;taxonomyABSTRACTAim The productivity, functioning and biogeochemical cycles of terrestrial ecosystems are strongly affected by leaf element concentrations. Understanding the biological and ecological factors affecting leaf element concentrations is therefore important for modelling the productivity and nutrient fluxes of ecosystems and their responses to global change. The present study aimed to determine how leaf element concentrations are linked to taxonomy and the environment.Location China.Methods The concentrations of 10 leaf elements of 702 terrestrial plant species from different biomes were extracted from publications. The links between environmental variables, taxonomy and leaf elements were analyzed using phylogenetically comparative methods and partial Mantel tests.Results Taxonomy had stronger effects on leaf S and SiO2 than latitude, explaining 40.2–43.9% of total variation, whereas latitude had stronger effects on leaf N, P, K, Fe, Al, Mn, Na and Ca concentrations, explaining 19.5–52.1% of total variation. Leaf N, S, Al, Fe and Na concentrations were correlated with mean annual precipitation (MAP), while leaf N, P and Fe concentrations were correlated with mean annual temperature (MAT). Latitude, MAP and MAT were significantly correlated with the first axis of a principal components analysis (PCA). This first axis was associated with leaf elements involved in protein synthesis and photosynthesis. The other PCA axes, which were not correlated with MAT, latitude and MAP, were associated with leaf elements responsible for cell structure and enzymes.Main conclusions Leaf element concentrations of terrestrial plants in China were correlated with climate, latitude and taxonomy. With the exception of S and SiO2, the environmental factors were more important in explaining leaf element variation than taxonomy. Therefore, changes in temperature and precipitation will directly affect the spatial patterns of leaf elements and thus the associated nutrient fluxes and ecosystem functioning.
